Mitsubishi Grandis. Manual — part 78

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-309

DIAGNOSIS PROCEDURE

Step 1. Check that the headlamps operate.
Do the low-beam headlamps illuminate when the
lighting switch is turned to the HEAD position?

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

First, repair the headlamps. Refer to
Inspection Procedure M-2 "The low-beam
headlamps do not illuminate normally

P.54C-275

."

Step 2. Check the power supply circuit.
When the ignition switch is turned to the LOCK
(OFF) position, check if the hazard warning lamps
illuminate.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Refer to inspection procedure A-2 "Check
the ETACS-ECU battery power supply
circuit"

P.54B-87

.

Step 3. Pulse check
Check the input signals below, which are related to
the daytime running lamp function.

OK: The MUT-III sounds or the voltmeter
needle fluctuates.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Refer to inspection procedure Q-2 "The
ignition switch (IG1) signal is not received

P.54B-420

."

Step 4. Connector check: C-221 ETACS-ECU
connector.

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Repair the defective connector.

Step 5. Resistance measurement at the C-221
ETACS-ECU connector.
(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Check the resistance between the ETACS-ECU

connector and body earth.

• Resistance between C-221 ETACS-ECU

connector terminal No.64 and body earth

OK: 2

Ω or less

Q: Is the check result normal?

YES :

Replace the ETACS-ECU.

NO :

Go to Step 6.

Step 6. Check the wiring harness from C-221
ETACS-ECU connector terminal No.64 to body
earth.
NOTE: Prior to the wiring harness inspection, check
jumper connector C-101, and repair if necessary.

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES :

Replace the ETACS-ECU.

NO :

Repair the wiring harness.

System switch

Check condition

Ignition switch (IG1)

When turned from ACC
to ON

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-310

FLASHER TIMER

Inspection Procedure N-1: The turn-signal lamps do not illuminate.

CAUTION

Whenever the ECU is replaced, ensure that the
input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

If all the turn-signal lamps do not illuminate, the
ignition switch (IG1), the turn-signal lamp switch
input circuit or the ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check that the hazard warning lamps
operate.
Check that the hazard warning lamps illuminate
normally.

Q: Is the check result normal?

Wire colour code
B : Black LG : Light green G : Green L : Blue W : White Y : Yellow SB : Sky blue
BR : Brown O : Orange GR : Gray R : Red P : Pink V : Violet

ETACS-ECU

J/B SIDE

RELAY
BOX

TURN-SIGNAL
LAMP RELAY: LH

TURN-SIGNAL
LAMP RELAY: RH

FRONT TURN-SIGNAL
LAMP (LH)

REAR TURN-
SIGNAL LAMP

SIDE TURN-
SIGNAL LAMP

FRONT TURN-
SIGNAL LAMP (RH)

FUSIBLE
LINK

26

Turn-Signal Lamp Power Supply Circuit

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-311

YES :

Go to Step 6.

NO :

Go to Step 2.

Step 2. Connector check: C-219 ETACS-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the defective connector.

Step 3. Voltage measurement at the C-219
ETACS-ECU connector.

(1) Remove the ETACS-ECU, and measure at the

junction block side.

(2) Voltage between C-219 ETACS-ECU connector

terminal No.11 and body earth

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Go to Step 4.

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block
(Rear view)

<RHD>

AB

Junction block side

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block
(Rear view)

<RHD>

AB

Junction block side

AC310507 BZ

Connector C-219
(Junction block side)

2019

7

13

17

18

1615 14

10

11

12

9 8

2

6 5

3

4

1

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-312

Step 4. Check the wiring harness between C-219
ETACS-ECU connector terminal No.11 and the
fusible link (26).

NOTE:

Prior to the wiring harness inspection, check
intermediate connector C-125 and junction block
connector C-203, and repair if necessary.

• Check the power supply line for open circuit.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00

− How to

Cope with Intermittent Malfunction

P.00-5

).

NO :

Repair the wiring harness.

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block
(Rear view)

<RHD>

AB

Junction block side

AC310613

AD

Connector: C-125 <LHD>

AC310628AB

Connector: C-125 <RHD>

AC310623

Connectors: C-203 <LHD>

AL

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)

AC310618

Connectors: C-203 <RHD>

AK

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

Junction block (Front view)